1.Long life 2.advantage:sharp,high efficiency 3.colour:black 4.abrasive:silicon carbide 5.durable Above is usual ... wares; building metal ware; metal watchband, lamps and lanterns raket of gulf; copper wares, aluminium ware, plating copper and bronze, ... wares, marble, etc…Feature:No blockage under high rotation speed, good brightness, excellent grinding effect, durable for using, convenient to use.